331135221 has 8 divisors (see below), whose sum is σ = 442184224. Its totient is φ = 220421520.

The previous prime is 331135219. The next prime is 331135241. The reversal of 331135221 is 122531133.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 331135221 - 2¹ = 331135219 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331135241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81511 + ... + 85476.

It is an arithmetic number, because the mean of its divisors is an integer number (55273028).

Almost surely, 2^331135221 is an apocalyptic number.

It is an amenable number.

331135221 is a deficient number, since it is larger than the sum of its proper divisors (111049003).

331135221 is a wasteful number, since it uses less digits than its factorization.

331135221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167651.

The product of its digits is 540, while the sum is 21.

The square root of 331135221 is about 18197.1212283702. The cubic root of 331135221 is about 691.8338259424.

Adding to 331135221 its reverse (122531133), we get a palindrome (453666354).

The spelling of 331135221 in words is "three hundred thirty-one million, one hundred thirty-five thousand, two hundred twenty-one".